Collapsible walker



FIG. 1 is a top view of a collapsible walker showing my new design;

FIG. 2 is a bottom view thereof;

FIG. 3 is a perspective view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a rear elevational view thereof; and,

FIG. 7 is a right side elevational view thereof.

The broken line showing of a user of the collapsible walker shown in FIG. 3 is for demonstrative purposes only and forms no part of the claimed design. 

The ornamental design for a collapsible walker, as shown and described. 